An elastic material of compact structure usually having a smooth surface. It may or may not have a nonrubber backing or a metallic cloth insertion. It is produced in various thicknesses. Sheets are limited to widths greater than 6 inches (152.4 mm). For rubber sheets with one or more nonmetallic cloth inserts, see RUBBER SHEET, SOLID, CLOTH INSERT. For items that are basically cloth, coated on one or both sides, see CLOTH, COATED; and CLOTH, LAMINATED. Excludes RUBBER SHEET, INNER TUBE REPAIR.